So sánh phương pháp

	Mô hình Rasch dạng rút gọn	Chức năng biệt lập của mục (Differential Item Functioning - DIF)
Lĩnh vực	Trắc lượng tâm lý	Trắc lượng tâm lý
Họ	Latent structure	Latent structure
Năm ra đời	1960 (Rasch model); short-form application from 1980s onward	1970s–1993
Người khởi xướng	Georg Rasch	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
Loại	Probabilistic item response model	Item-level bias detection
Công trình gốc	Rasch, G. (1960). Probabilistic models for some intelligence and attainment tests. Danmarks Paedagogiske Institut.	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
Tên gọi khác	Rasch analysis for abbreviated scales, short scale Rasch calibration, brief instrument Rasch model	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
Liên quan	6	5
Tóm tắt	The short form Rasch model applies Rasch measurement theory to abbreviated instrument versions. Rather than using all items from a full scale, researchers select a reduced item set and calibrate it under the Rasch model to verify that the shortened instrument preserves interval-level measurement, adequate person separation, and item fit, enabling efficient yet rigorous measurement with fewer items.	Differential item functioning identifies test or survey items that behave differently for examinees from different groups — such as gender, ethnicity, or language background — after controlling for the underlying ability or trait being measured. DIF analysis is essential for fairness evaluation in educational testing and psychological scale development.